Insulator for spark-plugs



I. INGELS. msuLAT'oR ma SPARK PLUGS.

APPLICATION FILED HOV. 28,1919.

Patgmfi Jane E, 1925 W, m W $0M ie/r155 INQELS, {My

JAMES means. or srninerrnnn, mmors.

Insurances non srAaK-rmrss.

anemia,

State of Illinois, have invented a new and useful Insulator for Spark-Plugs, of which the following isa specificationj This invention relates to insulators, com- ,moni of porcelain, mica or glass, such as are used inconjunction with the spark plugs of internal combustion engines.

' Thepurposes of the invention are: to provide an insulator of new and improved form adapted to utilize more effectively than has hitherto been done the heat absorbed by and radiated from the insulator during the operation of'the engine with which the spark plug is used; to provide an insulator having a combustion chamber wholly within the insulator in .contradistinction to insulators of the type in which the space between the outer surface of the insulator and the inner surface of the casing of the spark plug is the combustion chamber; to provide an insulatorformed to litclosely in the cats ing of the spark plug in ordertthat the wall of the casing may reinforce and strengthen that wall of the insulator which surrounds the combustion chamber, thus minimizing so the risk of rupture of the insulator by the force of the explosions in the engine cylinder; to provide in the body of the insulator a pocket entirely apart from the combustion chamber adapted to house means for adjusting the electrode; and to provide'other new and useful structural details.

The invention is illustrated in the annexed drawing, to which reference is hereby made and will now be described and the 4G novel features thereof will be recited in the claims. I

Figure .1 1s a combined'vlew showing in elevation an insulator embodying my invention and showing in vertical section. the casing and the bushing of a spark plug in which the insulator is installed; Fig. 2 is a vertical longitudinal section through the insulator on the line 2. 2. of Fig. 1; Fig. 8 is a horizontal transverse section through the insulator and the casing of the sparkplug on the line 3. of Fig. 1.: and Fig. 4 is a horizontal transverse section through the insulator and the casing of the spark plug on the line 4. 4. of Fig. 1. The same v reference numerals designate the same parts Specification of Letters Patent Pate/n terlJune i, 1920. application filed November 28, 19 13. Serial No. 341,081. 2 I i 1n alithe 'YIE'WS. lathe-r rawings only, so

'of spark plug and an insulator fitted to that particular type of spark plum. Itis to be understood however, that myinvention is not restricted to an insulator of themecise form shown, sm'ceit'is obvious that the external contour of the insulator may.

be varied to suit the internal contours of the casings and bushings of different spar: plugs without changing any essential internal construction of the insulator.

The insulator will be made of porcelain, mica, glass or other-material most suitable for the particular purpose for which the insulator is to be used, f

The insulator of preferred construction comprises a circular body 5, a circular upper member 6, of less diameter than the body 5, a circular lower member 'i', of less dianieter than the body, a beveled shoulder 8 at the juncture of the member 6 with the body 5, a shoulder 9 at the juncture of the member 7 with the body 5, a central bore .10 extend ing through. the member 6, the body 5 and the member 7. Inside the member 7 is a circular combustion chamber 12, the'height of the chamber being approximately equal to the diameter of the member 7. the chamber 12 is a sleeve 13 integral with the member 7. The wall of the sleeve 13 protects the electrode 14: and is practically the same thickness as the circularwall. of

the combustion chamber in order that. both may be heated alike during the compression and explosion of gases in the combustion chamber and may alike radiateheat to effectually volatilize any hydrocarbon remain.- ing in the combustion chamber after any explosion, so that at the next succeeding ignition the accumulated hydrocarbon will'be burned and the interior of the combustion chamber will thereby be completelycleaned I have Inside and will continue to be self-cleaning so long as the engine remains in operation.

Inside the body 5 is a pocket 15 adapted to house an adjusting nut 16 and keep it from turninq'. After the nut is in place in the pocket supplemental insulation 17 will be used to close the mouth of the pocket;

The spark pliig casing-18 and the 19 are commonly of brass. The bushing screws into the casing.

In the present instance the circular outer wall of the member 6 contacts closelywith the inner wall 200:? the bushing 19-, the

circular outer Wall of the body 5- contacts closely with the inner wall 21 of the casing 18; the circular outer wall of the member 7 contacts closely with the inner wall 22 of the screw member of the casing '18; a copper-asbestos gasket 24- is interposed between the shoulder 8 of the insulator and the flared terminal 2505? the bushing; and a similar gasketQG 1s interposed between .the shoulder 9 of the insulator and the flared terminal 27 of the member 23 of the casing. By reason of the continuous close contact of practically the entire outer surface of the insulator with the inner surfaces of the.

- casing and the bushingthe insulator'is reinforced and strengthened to Withstand the hard service to which it is subject.

The electrode la is screw threaded for the greater part of its length and screws into the stationary nut 16. Upon rotating the electrode its lower terminal may be moved lnward or outward according to the direction, to vary the spark gap asjinay be desired.

Having fully described my invention, What I claim as new and desire to secure by Letters Patent is:

1. An insulator comprising a body an ing the mouth of the pocket of the main insulator.

In witness whereof I have hereunto signed my name at Springfield, Illinois,v this 24th day of November, A. D. 1919.

JAMES ING'ELS.

.Witnesses:

' DANIEL D. MORGAN,-

Geo. A. MILLER. 

